First off, I must say that the cinematography is absolutely stunning and the acting was great. What made the film worth watching however, was Clint Mansell's score. A masterpiece.
There's basically no real dialogue in the film. It's 98% imagery, i didn't mind at first, but halfway through it became so redundant and exhausting to watch a film with no conversations. This uber-Indie, "i'm so alternative" avant-garde nonsense became unspeakably annoying. The whole film is just a collection of vivid dreams and paranoias, with one or two words thrown in.
Also, easily one of the most abrupt, "what just happened here?" kind of endings.
I only finished watching it because i loved the music. I'm quite disappointed. I really wanted to love it, but it was 100% just beautifully boring.
My recommendation? Skip the movie and just listen to the soundtrack.